GIT_SILENT Update Appstream for new release

(cherry picked from commit 73ae918c)

src/org.kde.partitionmanager.appdata.xml

@@ -265,9 +265,9 @@ SPDX-License-Identifier: GPL-3.0-or-later
     <binary>partitionmanager</binary>
   </provides>
   <releases>
+    <release version="21.08.1" date="2021-09-02"/>
     <release version="21.08.0" date="2021-08-12"/>
     <release version="21.04.3" date="2021-07-08"/>
     <release version="21.04.2" date="2021-06-10"/>
-    <release version="21.04.1" date="2021-05-13"/>
   </releases>
 </component>